German chemical company Bayer AG said it would pay an estimated 40 percent of a $640 million settlement offer to end lawsuits from U.S. hemophiliacs infected with HIV from tainted blood.

Baxter International Inc., France's Rhone-Poulenc Rorer Inc., Alpha Therapeutics Inc., a unit of Japan's Green Cross Corp., and Bayer are to send letters offering to pay $100,000 to each of the estimated 6,000 hemophiliacs infected with the deadly HIV virus, a Baxter spokeswoman confirmed.